Bonnar tested positive for the performance enhancing steroid known as drostanalone just after the losing the fight via TKO. According to the interview he didn’t take the substance looking to cheat but rather to quickly heal his ongoing knee issues in preparation for the biggest fight of his life:

“Believe it or not, there are some therapeutic uses to some of the banned substances. Bottom line, I wanted to get my strength back. I was very weak. My body didn’t feel good, my joints didn’t feel good. That was my goal.”

Knowing full well that he wasn’t in fighting shape, and with only three weeks left to train, Bonnar felt he ultimately made the right decision:

“I’m not a stupid person. Of course, I know I’m going to get tested. I got three weeks to train for the fight, and 35 pounds to lose, and you really think after that I’m going to take something that’s detectable for a month? That makes no sense. Absolutely none.”

Although Bonnar had been told that the substance would be out of his system by the time testing came around, that unfortunately did not happen to be the case.

In a matter of days Bonnar was left with both a devastating loss and a public lashing by both the fans and his long time friends/employers at the UFC. After campaigning so strongly for a big fight before his exit from the sport, Bonnar seems filled with shame after tainting such a lucrative once in a life time opportunity:

“That was the hardest thing, too. You know, there’s no way if I thought there was any possibility of it showing up, that I would have taken the fight. I finally get the opportunity I’ve been begging for in vain for so long. I thought I’d go out there and put on a better fight, but then stuff like this happens. It’s like I came to his house and took a s— on his carpet. It just kills me. I’m like, ‘Come on, Dana, give me this opportunity,’ and then I make him look like that. I’m really sorry.”

“I feel the best thing for me to do is to respectfully piss off. It’s not to sit there and go, ‘Oh, come on Dana, give me another chance.’ I f—– up and I’ll put my tail between my legs and leave you guys alone for a while.”

Bonnar relayed in the interview that he is unsure what the future currently holds for him, nor does he know exactly what he plans on doing. The only thing he knows is that although he won’t be fighting any longer, he would still love to remain working with the sport in some capacity.

“That was really important to me, to be part of the UFC in ways other than fighting. That’s been hardest thing for me. I worked so hard over the years doing all those things to kind of give myself a home in the UFC outside of the actual fighting part of it, and I feel I ruined that.”

i mean if he's injured he should just turn down the fight there's nothing he can do about it, he should not use steroids, i lost my respect for him, i mean steroids is not the option, he should work hard and continue his winning ways, then the opportunity will come.

I'm not condoning what he did, but it's easy to be critical when you're not in his position. Some truck drivers go into work on very little sleep, some cops go into work still not fully sober from the night before, some teachers go in with illegal substances in their body. Does it make it right? Nope. But when your livelihood and the opportunity to make a living is on the line, a human being will do extraordinary things.

Because, at the end of the day, "going into work" is simply an opportunity to make a living…..whether you're a trucker hitting the road for 16 hours on little sleep, a cop working a shift with a buzz, or a a hypocritical teacher instructing kids how to live, or Stephan Bonnar stepping into the octagon with a banned substance in his body. It's all an opportunity to make a living, and to some, the risk is worth the reward.

i did like him commentating, it ***** he chose the route he did but every one makes dumb mistakes. i think Fox should get Bonnar and Forrest, and do a show…the possibilities are endless lol never had anything against Bonnar he always went in to fight.

condit will get tko'd in the 3rd! Hendricks will then go on to have a fight with gsp only to have gsp fake a bad injury and sit out for enough time to have hendricks fight macdonald, macdogg will win gain the interim belt, meanwhile Anderson silva is whipping on Weidman and retains his belt, GSP then miraculously heals again ever too quickly and comes in to fight Anderson..A.S then whips him too sending GSP to retire (as he only has 2 fights left anyways). only to go on and fight jon jones @ 192 in which he tko's him via 1 2 4(jab, straight, knee) in the 4th only to become the single best champion ever. meanwhile Cruz gets stripped becomes a commentator and renan barao becomes the official champion beating Erick Perez leaving him to ove down and take the 125 l belt from mighty mouse…while this is happening JDS makes his 3rd title defense against velasquez who lost the belt a year prior and that would make it their 4th fight.

They cut a guy on a winning streak for testing positive for marijuana and they keep a guy who lost on the payroll who has tested positive for steroids twice, I wish the UFC had more consistent policies. I like Bonnar but he should be cut and put on the analysis table.